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Slide 13
MCS08QG8 Demo Kit
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User Options
Pushbutton Switches
> SW1 and SW2 connect to input ports PTA2 and PTA3 respectively.
LED Indicators
> MCU ports PTB6 and PTB7 drive LED1 and LED2 respectively.
Potentiometer
> The potentiometer is connected between VDD and GND with the
center tap providing the divider output. This center tap is connected to
the MCU on signal PTA0.
Photocell
> Current flow within the phototransistor is inversely proportional to light
intensity incident on the surface of the device. A rail-to-rail OP amp at
U2 boosts the photocell output to useable levels. This signal is
available to the MCU on signal PTA1.
